Ashton Kutcher and Mila Kunis are so ‘90s! The pair were spotted packing on the PDA while attending a Backstreet Boys concert at the Sphere in Las Vegas on Saturday, Aug. 2. The band is currently performing a residency at the venue through Aug. 24. Kutcher, 47, and Kunis, 41, danced and sang along to the band's 1999 hit "I Want It That Way" from their third studio album, Millennium. A video showed the couple singing the romantic lyrics to each other as they gestured dramatically with their hands. The Bad Moms actress, at one point, drew her husband closer, and he wrapped his arms around her waist.
